21012202212100 has 36 divisors (see below), whose sum is σ = 49741613239248. Its totient is φ = 7640800804000.

The previous prime is 21012202212097. The next prime is 21012202212109. The reversal of 21012202212100 is 121220221012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21012202212109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9550999906 + ... + 9551002105.

It is an arithmetic number, because the mean of its divisors is an integer number (1381711478868).

Almost surely, 2^{21012202212100} is an apocalyptic number.

21012202212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012202212100 is an abundant number, since it is smaller than the sum of its proper divisors (28729411027148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012202212100 is a wasteful number, since it uses less digits than its factorization.

21012202212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19102002036 (or 19102002029 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21012202212100 its reverse (121220221012), we get a palindrome (21133422433112).

The spelling of 21012202212100 in words is "twenty-one trillion, twelve billion, two hundred two million, two hundred twelve thousand, one hundred".